Abstract
A novel method to assess a crack growing/damage event in fibre reinforced plastic, using conventional single mode Fibre Bragg Grating sensors embedded in the host material is presented in this article. Three different damage mechanisms that can change the sensor output, longitudinal strain \( \varepsilon_{xx} \), transversal stress \( \sigma_{yy,zz} \), and non-uniform strain \( \varepsilon_{xx} (xx) \), were identified. These damage mechanisms were identified during the experimental testing and linked with the sensor output using a digital image correlation technique. A dedicated algorithm to extract information from the reflected spectrum that enables crack detection was developed. Double Cantilever Beams specimens made with glass fibre and bonded with structural adhesive, were instrumented with a Fibre Bragg Grating array embedded in the host material, and tested using an experimental fracture procedure. This method was successfully validated in three different loading conditions, where were obtained very promising results that enable crack growth monitoring.
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Acknowledgements
The authors acknowledges the Seventh Framework Programme (FP7) for funding the project MareWint (Project reference: 309395) as Marie-Curie Initial Training Network, Fibersensing for providing the FBG sensors and hardware, and SSP-Technology for providing the material tested.
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Pereira, G., Mikkelsen, L.P., McGugan, M. (2016). Fibre Bragg Grating Sensor Signal Post-processing Algorithm: Crack Growth Monitoring in Fibre Reinforced Plastic Structures. In: Ribeiro, P., Raposo, M. (eds) Photoptics 2015. Springer Proceedings in Physics, vol 181. Springer, Cham. https://doi.org/10.1007/978-3-319-30137-2_5
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DOI: https://doi.org/10.1007/978-3-319-30137-2_5
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